package com.group3.customer.util;

import java.io.IOException;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.group3.entity.AMerchant;

public class JsonUtil {
	private static JsonUtil instance=null ;
	static {
		instance = new JsonUtil();//用空间换时间
	}
	
	public static JsonUtil getInstance() {
		return instance;
	}

	
	
	private static ObjectMapper mapper=new ObjectMapper();
	
	private JsonUtil() {
		
	}
	public String ObjectToJson(Object str){
		String jsonStr = null;
		try {
			jsonStr = mapper.writeValueAsString(str);
		} catch (JsonProcessingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return jsonStr;
	}
	public <T> T getObjectFromJson(String json, Class<T> clazz) {
        try {
            return mapper.readValue(json, clazz);
        } catch (JsonParseException e) {
            e.printStackTrace();
        } catch (JsonMappingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}
